Electrical flush receptacle



ELECTRICAL FLUSH RECEPTACLE Filed OC. 7. 1922 INVENTOR #Fev/n H NE/io VWM ATTORNEYS Patented Dec. 1.6, 1924.

UNITEDV STATES PATENT OFFICE.

ARVID H. NERO, OF NEW BRITAIN, CONNECTICUT, ASSIGNOR TO THE ARROW ELECTRIC COMPANY, OF HARTFORD,

NECTICUT.

CONNECTICUT, A. CORPORATION OF CON- ELECTRICAL FLUSH RECEP'IACIJEL Application tiled October 7, 1922. Serial No.V 593,001.

To all whom it may concern:

Bc it known that I, Anvm H. NERO, a citizen of the 'United States of America, residing at New Britain, in the county of Hartford and State of Connecticut, have invented certain new and useful Improvements in Electrical Flush Receptacles, ofv

which the following is a specification.

My invention relates to electrical flush receptacles, and particularly to flush receptacles of the screw plug type. The object of my invention is to simplify, lighten, and to reduce the number of parts and the cost of manufacture of a receptacle of vthis type.

In the accompanying drawings- Fig. A1 is a plan view of a receptacle in which my invention is embodied;

Fig. 2 is an inverted plan thereof;

Fig. 3 is a section on the line 3-3, Fig. 1;

Figs. 4 and 5 are perspective views of the two wire terminal straps of the receptacle; and

Fig. 6 is a. perspective of a modification.

The present receptacle comprises an insulating body 6 of porcelain, or other moldable insulating material, the central area of which is substantially cylindrical and is recessed from the face of the receptacle to afford a well for the reception of thevusual screw shell contact 7. From the opposite side of the central area, and on the same diameter, extend end ribs 8 and 9 of materially less depth than the body of the receptacle, but of sufficient size to afford a substantial mechanical support for the metal ear pieces 10 and 11 by which the receptacle is mounted in usual fashion in an outlet box. The ribs 8 and 9 are pierced to receive the ear holding bolts 12, while the ear pieces 10 and 11 are pierced at 13, adjacent their free ends, to accommodate the screw bolts (not shown) by which the receptacle is clamped. in the outlet box.

Projecting from the lower portion of the body 6 and adjacent, but on opposite sides of the respective end ribs 8 and 9, to which they are united, are depressed ledges 14 and 15 for the support of the wire terminal straps 16 and 17 respectively. The level of the ledges 14 and 15 is considerably above the bottom of the well 18 in which the receptacle contacts are seated. The terminal straps 16 and 17 haye therefore downwardly angled reaches 19 and 2O respectively connecting their binding screw ends with their contact ends 21 and 22 respectively, by which electrical connection is established with the receptacle contacts. Thus, the end 21of the .strap 16 is forked to straddle the horse-shoe shaped boss 23 which projects upward from the bottom of the wel] 18, and to overlie the base flange 24 of the screw shell 7. The ends of the fork are tapped at 25 to receive holding screws 26 which pass through the bottom of the well 18 and mechanically secure the strap in position as well as establishing electrical contact between it and the screw shell. \'l`he inner end 22 vof the strap 17 is tapped at. 27 to receive the holding screw 28, which also passes through the bottom of the well and serves to mechanically and electrically connect the base of the eenter contact 29 over which the end 22 of strap 17 lies. Both of the latter are con- Afined by the sides of the' horse-shoe boss 23 and are thus prevented from swiveling.

It will be noted that there are but three holding screws, 26 and 28, piercing the body of the receptacle, and that these screws serve to mechanically secure in position both the screw shell and vcenter contact of the receptacle as well as their associated wire terminal straps 16 and 17. The latter are supported at their free outer ends on the ledges 14 and 15, which are of suliicient mechanical strength to withstand the thrusts imposed by the turning down of the binding screws 30 to clamp the leading-in wires. The ledges are recessed at 31 to afford play for the projecting inner ends of the binding screws It may be pointed out furthermore that inasmuch as the wire terminal straps 16 and 17 are directly engaged with the receptacle contacts 7 and 29, the screws 26 and 28 which establish this connection need not be of brass or other relatively expensive conductor, but

' may be of relatively cheap ferrous material.

nor thc ribs 8 and 9 extend the full depth of the receptacle, they are of sutiicient ruggeduess to withstand the mechanical strains imposed thereon, and are not only integral with tbe body of the receptacle, but also united in pairs by tie webs so that the oneA member of each pair reinforces the other l:1; I'ainst lateral shocks.

tween the wire terminals and the receptacle contacts.

In Fig. (3 a still more economica-l form of center contact construction is shown, in which the contact proper 30 is integral with the wire terminal strap 31.

Other moditications will readily occur to those sltilled'in the art, without departing from what I claim .as my invention. y'

I claim- 1. An electrical Hush receptacle of the screw shell type, comprising a molded insulating body of generally cylindrical central shape, ribs integral therewith and projecting on the same diameter'from opposite sides of the upper portion of said central body member, supporting means secured to said ribs, imperforate depressed ledges projecting from the lower portion of said central area adjacent said ribs, but on opposite sides of the latter at opposite ends of the receptacle, said ledges being connected to said ribs and shaped for the reception of binding terminals, said cylindrical central body area of the receptacle being recessed from the face of the latter to aii'ord a depressed well having the bottom at a level below the level of the depressed wire terminal ledges and having a center contact-loeating projection 11p-standing from the bottom of said well and extending toward one of said depressedledges, the Wall of said cylindrical body portion being apertnred in register with the depressed ledges lby recesses extending through the base o the receptacle.

2. The combination with. thc construction specified in claim l, of a screw shell contact having a base flange resting in said v well and straddling said center contact-locating projection. a wire terminal strap hav- .ing an offset binding screw endresting freely on one of said depressed ledges, and a bearing end to overlie the base `flange of the screw shell contact, together with a second otiset wire terminal strap resting at one end on the other depressed ledge and' hai/inge. base portion extending downward therefrom toward the bottom of the.l screw shell well and entering the center contact-locating projection in said well, and a center Contact associated with said second wire terminal strap, ,saidv terminal straps passing from their respective supporting ledgesl into the -well through the apertures in the wall of the cylindrical body portion of the receptacle. j

3. The combination with the construction specified in claim 1, of a screw shell contact having a base flange resting in said well and straddling said center contact-locating projection, a wire terminal strap having an ofi'-l set binding screw end resting freely on oneof said depressed ledges, and a bearing end to overlie the base flange of the screw shell contact, a second oii'set wire terminal strap resting at one end on the other depressed ledge and having a base portion extending downward therefrom toward the bottom of the screw shell well and engaging the center contact-locating projection in said well, together with holding screws passing through the bottom of said well, said screws engaging the ends of the wire terminal straps which project into the well and serving to mechanically secure and electrically connect the conducting members of the receptacle, substantially as described.

In testimony whereof I have signed my name to this specification.

ARVID I-I. NERO. 

